Because they need to better educate themselves.
On Lilly: Career Potential -- Decent mid-rotation lefty.
On Theriot: Career Potential -- Steady utility man.
On Ryan Ludwick: Career Potential -- A platoon or fourth outfielder.
I'm sure there are others. Is someone getting paid to write these? If so they're not very good at their job! Al how do I inquire about replacing this person? Just kidding. Well, kinda. It would be a fun job!